refactor: code optimisation for erc20

[ArunBala-Bitgo]

Ticket: WIN-7914

Optimisation:

coinFactory.ts - Added map-based routing for EthLike chains

Adding to the above map would reduce code bloat by decreasing the size of the switch case. Around 6 chains from the switch case would be removed and added to the map, and future coins would only be added to the map, reducing multiple lines of code and code bloat for each chain.

tokenConfig.ts - Currently has repetitive token config functions

the above generic method reduces around 120 lines by removing all the token specific methods:

function getOgTokenConfig(coin: EthLikeERC20Token): EthLikeTokenConfig {
  return {
    type: coin.name,
    coin: coin.network.type === NetworkType.MAINNET ? 'og' : 'tog',
    network: coin.network.type === NetworkType.MAINNET ? 'Mainnet' : 'Testnet',
    name: coin.fullName,
    tokenContractAddress: coin.contractAddress.toString().toLowerCase(),
    decimalPlaces: coin.decimalPlaces,
  };
}
const getFormattedOgTokens = (customCoinMap = coins) =>
  customCoinMap.reduce((acc: EthLikeTokenConfig[], coin) => {
    if (coin instanceof EthLikeERC20Token && (coin.name.includes('og:') || coin.name.includes('tog:'))) {
      acc.push(getOgTokenConfig(coin));
    }
    return acc;
  }, []);

function getSeievmTokenConfig(coin: EthLikeERC20Token): EthLikeTokenConfig {
  return {
    type: coin.name,
    coin: coin.network.type === NetworkType.MAINNET ? 'seievm' : 'tseievm',
    network: coin.network.type === NetworkType.MAINNET ? 'Mainnet' : 'Testnet',
    name: coin.fullName,
    tokenContractAddress: coin.contractAddress.toString().toLowerCase(),
    decimalPlaces: coin.decimalPlaces,
  };
}
const getFormattedSeievmTokens = (customCoinMap = coins) =>
  customCoinMap.reduce((acc: EthLikeTokenConfig[], coin) => {
    if (coin instanceof EthLikeERC20Token && (coin.name.includes('seievm:') || coin.name.includes('tseievm:'))) {
      acc.push(getSeievmTokenConfig(coin));
    }
    return acc;
  }, []);

This avoids code repetition, keeping the code clean and preventing code bloat.

Also extracted TokenNetwork interface and created reusable type definition for token network structure, created getFormattedTokensByNetwork helper and consolidated mainnet/testnet token formatting logic

Before & After
Before (Token Configuration)

After (Token Configuration)

Test case results:

[Taseen08]

lgtm from WP, coins team review would be more relevant

[pritam-gembali]

Good effort to simplify. Let's do it the right way please

[mmcshinsky-bitgo]

Can we add tests to make sure there aren't any regressions to these changes?

[Taseen08]

can we address the comment regarding test cov?

[ArunBala-Bitgo]

Can we add tests to make sure there aren't any regressions to these changes?

Added test cases for all the newly added methods and to ensure it doesn't affect any existing data:

[Taseen08]

lgtm

concerns addressed - EthLikeErc20Token is used for evm coins and ERC20Token instance is already being used by eth coin